apple carplay not working: 5 Root Causes Behind the Problem Apple CarPlay not working rarely has a single explanation. A federal vehicle-safety bulletin on CarPlay connectivity interruptions lists hardware, software, and environmental factors as distinct, overlapping categories of cause — which means the right fix depends on identifying which category applies, not on working through a generic list. This article groups the most common causes into five categories and pairs each with its direct fix. Cause: Physical Connection Damage (Wired CarPlay) A damaged or poor-quality USB cable, or dust and debris inside a USB port on either the iPhone or the head unit, can cause intermittent or total loss of…